/* 添加边框 */
#wendu {
	border-collapse: collapse;
}

/* 只有水平边框 */
#wendu tr th {
	border-left: 0px;
	border-right: 0px;
}

#wendu tr td {
	border-left: 0px;
	border-right: 0px;
}

#wendu tr:nth-of-type(2n-1), #wendu th:nth-of-type(2n-1) {
	background-color: orangered;
}

#wendu tr:nth-of-type(2n), #wendu th:nth-of-type(2n) {
	background-color: blue;
}
